2 And now, I pray you, let us proceed to the subject which has given rise to these observations. For well I know, that you are all eagerly awaiting this matter; and that each one of you is in pain till he learn on what account this Book was not given from the beginning. But even now I do not see that the time is fit for a discourse on this subject. And why so? Because the week has nearly arrived at its close with us, and I fear to touch upon a subject, the exposition of which I should presently afterwards be obliged to cut short.
For the subject requires of us several days in succession, and a continuous effort of memory: wherefore we must again defer it. But take it not amiss! We will assuredly pay you the debt with interest; for thus it is expedient both for you, and for us who are to discharge it. Meanwhile, however, let us now speak on that subject which we left out yesterday. And what was it we left out yesterday? “God was walking,” it says, “in Paradise in the cool of the day.” What is here meant, I ask?
“God was walking!” God was not walking; for how should He do this who is everywhere present and fills all things? But He caused a perception of this sort in Adam, in order that he might collect himself; that he might not be careless; that in flying and in hiding himself, he might present beforehand some portion of the excuse, even before any words had passed. For even as those who are about to be led to the tribunal, to sustain the charges respecting the crimes they have committed, present themselves before those who are to try them with a squalid, begrimed, sad, and subdued visage, in order that from their appearance, they may incline them to loving-kindness, mercy, and forgiveness, so also did it happen in the case of Adam.
For it was necessary that he should be led to this Tribunal in a subdued state. Therefore God took him beforehand, and humbled him. But that some one was walking there, he perceived; but whence came he to suppose that God was walking there? Such is the habitual custom of those who have committed sin. They are suspicious of all things; they tremble at shadows; they are in terror at every sound, and they imagine that every one is approaching them in a hostile manner. Often therefore the guilty, when they observe people running on another business, suppose that they have come against them; and when others are conversing one with another on quite a different subject, they that are conscious of sin suppose they are conversing about them.
Source: Homilies on the Statues (New Advent)